Cimmyt Database

The CIMMYT database contains phenotypic field data that was collected for CIMMYT experiments collected at multiple locations.

The CIMMYT database schema is shown in the figure below:

Example Queries

Row-to-Column Query

FOR QUERY OF REPEATED MEASUREMENTS: This query can be used to extract a column format of a repeat measurements (over dates) for multiple traits.

The query below is an example of how to generate a report of the G-NDVI and R-NDVI traits from the 16OBR plots with B2I conditions, (bed planting and two irrigations) for the Elite Yield Trial (EYT).

SET SESSION group_concat_max_len = 10000;
USE cimmyt;
SET @SQL = NULL;
CREATE TEMPORARY TABLE IF NOT EXISTS p AS (SELECT * FROM phenotypes WHERE (YEAR(phenotype_date) = 2016 AND phenotype_value IS NOT NULL AND plot_id LIKE '16-OBR-B2I-EYT%' AND trait_id LIKE '%NDVI%'));
SELECT GROUP_CONCAT(DISTINCT CONCAT('MAX(IF(p.phenotype_date = ''', `phenotype_date`, ''',p.phenotype_value,NULL)) AS ''', `phenotype_date`,'''')
ORDER BY `phenotype_date` ASC  ) INTO @SQL FROM p;
SET @SQL = CONCAT('SELECT  p.plot_id,p.trait_id, ', @SQL, ' FROM p GROUP BY p.plot_id,p.trait_id ORDER BY p.plot_id');
PREPARE stmt FROM @SQL;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
DROP TEMPORARY TABLE p;